Safety device for gas and air mixing plants



Feb. 8 192 f 1,617,296 7 F.'WOL.FF

- SA FETY DEVICE FOR GAS A ND AIR MIXING PLANTS Filed May 21. 1925 2Sheets-Sheet 1 .j qgni 'MIZmQm j Feb. *8, 1927.

'F. WOLFF SAFETY DEVICE FOR GAS AND AIR MIXINGPLANTS Filed May 21. 19252 Sheets-Sheet 2 lnuenfor:

Patented Feb. 8, 1927.

UNITED STATES FRIEDRICH WOLFE, OF BERLIN, GERMANY.

SAFETY DEVICE FOR GAS AND'AIR MIXING PLANTS.

Application filed ma 21, 1925, Serial No. 31,978, and. in Germany may10, 1924.

This invention relates to safety device for gas and air mixing plants.

Regulating devices for gas and airhave already been proposed in which athermocouple is provided which projects into the cone of the flame of aBunsen burner 1n order to regulate the area of the gas and air feed soas to compensate for varia: tions in the composition of the mixture.With such means of regulation, however, it is possible that suddenvariations may occur in thecomposition of the mixture, for instanceowing to the partial or complete failure of the gas or air supply.

The present invention has for its object a safety device which'sooperates that if a sudden alteration takes 'place in the proportion ofthe mixture which is beyond the limits of control of the regulator, thegas and air supply is automatically cut off.

The invention consists essentially in the employment of a body that willburn, fuse or explode at a certain fairly low temperature, for example100 (1., which body is arranged in the inner flame cone of a test burnerfed by the gas mixture and on the destruction of this body a rod isreleased by which the fuel mixture of air and gas is cut off. I

An example of the invention is illustrated in the accompanying drawingsin which Fig. 1 is a sectional view of the burner, and Fig. 2 is adiagrammatic section of the plant associated with the burner.

The test burner consists of a Bunsen burner 1, which is fed with a fuelmixture of air and gas from the main conduit 12 by a branch pipe 2,which leads from the main conduit and is connected to the nozzle 2.Passing through the centre of this burner is a guide 3 in which isslidably arranged a rod 4. To the end of this rod a closing rod forcutting off the flow of an air and gas mixture is attached. 7

At the upper end of the rod 4 is a mass or body 5 which consistsof asubstance havsition of the mixture occur the cone or core of the flamewill change so that the tempera-' ture will increase thus causing-thebody 5 to fuse, burn or explode. The rod 4 is thus released and actuatesthe closing rod by the aid of a spring or the like.

In Fig. 2 of the drawing, 10 indicates a compressor for the gas and 11 acom ressor for the air; 12 is a mixing apparatus or gas and air in whichthe gas and air are combined.' Thismixture of gas and air flows from theplant 12 into a distributor conduit leading to the various places ofconsumption. In this distributor conduit there is inserted a rapidclosure valve maintained in open position by means of the lever which isconnected with the actuating bar 4 of the 'pilot burner by a suitableassembly of elements (as for instance bell crank 4*). Whenever the Iwrong proportion of mixture is formed the fuse at the pilot burner willburn through, the actuating bar 4 will drop and the lever 4 will rock,so that the valve plate,

of the rapid closure valve 13 also drops and thereby shuts off thecontinuedfiow of the gas and air mixture.

Claims:

1. A safety device for gas and air mixing plants including a mainconduit, and comprising a test burner, a branch pipe connecting saidburner to said main conduit, a member movable to close the gas and airsupply from said gas and air mixing plant, a body holding said member inits inoperative position. said body being destructible at acomparatively low temperature and being arranged in the minimum heatedcore of the flame of the burner which is normally at a temperature lessthan that at which the body is destructible.

2. A safety device for gas and air mixing plants including a mainconduit, and comprising atest burner, a branch pipe connecting saidburner to said main conduit, a guide in said burner,.a rod in saidguide, a body supporting 'said rod, a connection between said rod andmeans controlling the gas and air supply, said body being arranged inthe minimum heated core of the flame of the burner which is normally ata temperature leis than thatat which the body is destructi le. Intestimony whereof I have hereunto set my hand.

FRIEDRICH WOLFF.

1,617,296 PATENT orrlca.

